中学学科网 小学学科网 数字校园平台 组卷网 小学组卷网 教评网 学易书城
e卷通介绍 使用手册 收藏本站 有奖挑错建议
题型:解答题 难度系数:0.65 引用次数:432 更新时间:2019/06/15 10:41:48 题号:8221728
如图,在直角梯形eqId5ce7a06ae7a34393b92b5277978ac014中,eqId0d9961f0e84b4330a8b12a6efe4f3804,eqIdf635185beec44b6b86934e806f088b02, eqId18e3ae3e255349039d6726b8293c6cabeqIdded28dbc6ca54681ab966fe6545c6cdceqIdd9251115c9a9452088ecefa7fbb94bf8,点eqId93cbffaa5ae045d6ac45d1e979991c3aeqId34c6b6e427744abfb88dc90b8c7c2111上,且eqIdbae2ef596ca941b89c53f1059c2148aa,将eqId1ba8a6a849e04b31abd4a64a759061b5沿eqId7fd836b3d4ac4d398fb8e461e090364c折起,使得平面eqId0ab1105ccd73407e94304ecdd3826a0a平面eqId41b0fa6b45c44cf0aeaa1b53230916f1(如图),eqId92869ac114124367b45f631d030ed6bdeqId7fd836b3d4ac4d398fb8e461e090364c中点.
(Ⅰ)求证:eqId64d1930b6d2543918fe8f4cf888830c8平面eqId41b0fa6b45c44cf0aeaa1b53230916f1
(Ⅱ)求四棱锥eqIdade73050d9d84a649183fd4abf1227a9的体积;
(Ⅲ)在线段eqId1b51efe7c2fa42748ac5a6be262e2fa4上是否存在点eqIdd7be5abad1e34f6db17a56660de8d54f,使得eqId79bd4080945b4cba8e8cde7b608c5ac1平面eqId28f374605af2463f991d1dd23797fec1?若存在,求eqIdc02b3bc95ab346b89a60b73365aac0d3的值;若不存在,请说明理由.figure
类题推荐
【推荐1】如图所示,三棱柱eqId9881c5faa5cb449bb37fa59b41c76e43的侧面eqId0bd8d6a420744c698e9cb156a89b8b6f是圆柱的轴截面,C是圆柱底面圆周上不与AB重合的一个点。
figure
(1)若圆柱的轴截面是正方形,当点C是弧AB的中点时,求异面直线eqId710b690db05c4a9ca514d234b961f314AB的所成角的大小(结果用反三角函数值表示);
(2)当点C是弧AB的中点时,求四棱锥eqId463622216aa14a369d79f9d70b9f610d体积与圆柱体积的比.
难度系数:0.65使用:0次题型:解答题更新:2019/11/11
【推荐2】如图,在棱长为1的正方体eqId588284d93dc5489295f8f224f8e30d13中,点eqId2381423d4cd146cab95f55527681a766eqIdce3304c847ca47f486f045a4fbfc0ecd上移动,点eqId517584fed25c413ba8b7bb33ffa2d5c6eqId1b51efe7c2fa42748ac5a6be262e2fa4上移动,eqId467860ddcfd441eca91142c49104e960,连接eqId996e2048847f41d5a5fe0e2282909254.
figure
(1)证明:对任意eqId9f468bcd05ef429bb07e1c6824f2a481,总有eqIda1def6ea6ee046f283ff0b8a18656f92平面eqId4aacc54c93e24f50825e3af20e3dbbdf
(2)当eqId2381423d4cd146cab95f55527681a766eqIdce3304c847ca47f486f045a4fbfc0ecd中点时,求三棱锥eqId64c24fa8f82b471584e8ecf6d82ee439的体积
难度系数:0.65使用:124次题型:解答题更新:2019/10/26
【推荐3】如图,在三棱锥eqId12175c05cfe240a0b8270ee03df1962f中,eqId62d8369e43a6440b832664a3d6caa906为正三角形,eqId2381423d4cd146cab95f55527681a766为棱eqId6f782d71f5a7422aa78bd8204949ce26的中点,eqIdb1264d334b874eb29ab56a5bf884c764eqIdbaf4bcaef3f04b0a9a7845a37a18e065,平面eqId5346c14ae189426eb85ec11c3774037f平面eqId1bf8da710ed845aaadfe28ce37f184f2
figure
(1)求证:eqId44de76f807384d2aa7b12ae23edd1a24平面eqId1bf8da710ed845aaadfe28ce37f184f2
(2)若eqIdbaffac6b458f47bf9fcd80741ce2afe7,求三棱锥eqId92970bf7e00648119e0e124251561529的体积.
难度系数:0.65使用:0次题型:解答题更新:2019/11/11
试题点评
评论:
发布